in frontend/src/lib/cytoscape-cxtmenu/cxtmenu.js [262:275]
function updatePixelRatio() {
const pxr = getPixelRatio();
const w = containerSize;
const h = containerSize;
canvas.width = w * pxr;
canvas.height = h * pxr;
canvas.style.width = `${w}px`;
canvas.style.height = `${h}px`;
c2d.setTransform(1, 0, 0, 1, 0, 0);
c2d.scale(pxr, pxr);
}